Na, Min-Jeong

She is the younger sister of Na Kang-Lim, the main character of this work. Like most siblings, due to their small age difference, she does not get along very well with Kang-Lim. She appeared quite a bit in the beginning, but as the story progressed, her role gradually decreased and she became a character that only appeared once in a while.

(Source: Namuwiki, translated, edited)